linux-kernel - Re: [4.1.0-07254-gc13c810] Regression: Bluetooth not working.

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Date:	Mon, 29 Jun 2015 11:00:20 +0200
From:	Jörg Otte <jrg.otte@...il.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	"bluez mailin list (linux-bluetooth@...r.kernel.org)" 
	<linux-bluetooth@...r.kernel.org>,
	inux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [4.1.0-07254-gc13c810] Regression: Bluetooth not working.

2015-06-28 18:09 GMT+02:00 Alexey Dobriyan <adobriyan@...il.com>:
> On Sun, Jun 28, 2015 at 05:36:04PM +0200, Jörg Otte wrote:
>> 2015-06-26 16:28 GMT+02:00 Jörg Otte <jrg.otte@...il.com>:
>> > 2015-06-26 12:03 GMT+02:00 Jörg Otte <jrg.otte@...il.com>:
>> >> 2015-06-26 11:37 GMT+02:00 Marcel Holtmann <marcel@...tmann.org>:
>> >>> Hi Joerg,
>> >>>
>> >>>> Bluetooth is inoperable in current Linus tree and the
>> >>>> first bad commit is:
>> >>>>
>> >>>> 835a6a2f8603237a3e6cded5a6765090ecb06ea5 is the first bad commit
>> >>>> commit 835a6a2f8603237a3e6cded5a6765090ecb06ea5
>> >>>> Author: Alexey Dobriyan <adobriyan@...il.com>
>> >>>> Date:   Wed Jun 10 20:28:33 2015 +0300
>> >>>>
>> >>>>    Bluetooth: Stop sabotaging list poisoning
>> >>>>
>> >>>>    list_del() poisons pointers with special values, no need to overwrite them.
>> >>>>
>> >>>>    Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
>> >>>>    Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
>> >>>>
>> >>>> My BT adapter is an intel 8087:07da
>> >>>> I reverted that commit and this fixed the problem for me.
>> >>>
>> >>> today we had a patch from Tedd fixing the list initialization in the HIDP code.
>> >>>
>> >>> diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
>> >>> index 9070dfd6b4ad..f1a117f8cad2 100644
>> >>> --- a/net/bluetooth/hidp/core.c
>> >>> +++ b/net/bluetooth/hidp/core.c
>> >>> @@ -915,6 +915,7 @@ static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
>> >>>         session->conn = l2cap_conn_get(conn);
>> >>>         session->user.probe = hidp_session_probe;
>> >>>         session->user.remove = hidp_session_remove;
>> >>> +       INIT_LIST_HEAD(&session->user.list);
>> >>>         session->ctrl_sock = ctrl_sock;
>> >>>         session->intr_sock = intr_sock;
>> >>>         skb_queue_head_init(&session->ctrl_transmit);
>> >>>
>> >>> Could this be fixing it for you as well?
>> >>>
>> >> I will check this when I am at home in the
>> >> afternoon.
>> >>
>> >
>> > The patch works for me too.
>> >
>> Ok, this was a little bit hasty!
>> I now see the following additional problems:
>>
>> - System freeze on resume (occures always).
>> - System freeze on shutdown (occures sometimes)
>> - System freeze when BT-mouse is connecting (occures sometimes).
>>
>> Then I can't do anything except power off.
>>
>> This happens only if Bluetooth AND BT-mouse is activated.
>
> OK, what happens if you just revert only list_del patch?

I have applied this patch:

diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 9070dfd6b4ad..f1a117f8cad2 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -915,6 +915,7 @@ static int hidp_session_new(struct hidp_session
**out, const bdaddr_t *bdaddr,
        session->conn = l2cap_conn_get(conn);
        session->user.probe = hidp_session_probe;
        session->user.remove = hidp_session_remove;
+       INIT_LIST_HEAD(&session->user.list);
        session->ctrl_sock = ctrl_sock;
        session->intr_sock = intr_sock;
        skb_queue_head_init(&session->ctrl_transmit);

without this patch bluetooth doesn't work at all for me.

Thanks, Jörg
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